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  1. #define F_CPU 7372800UL
  2.  
  3. #include <avr/io.h>
  4. #include <util/delay.h>
  5. #include <stdlib.h>
  6. #include <avr/interrupt.h>
  7.  
  8. #include "lcd.h"
  9.  
  10. void writeLCD(uint16_t adc) {
  11. lcd_clrscr();
  12.  
  13. char adcStr[16];
  14. itoa(adc, adcStr, 10);
  15. lcd_puts(adcStr);
  16. }
  17.  
  18. ISR(TIMER0_COMP_vect){
  19. writeLCD(ADC);
  20. }
  21.  
  22. int main(void)
  23. {
  24. DDRD = _BV(4);
  25.  
  26. TCCR1A = _BV(COM1B1) | _BV(WGM10);
  27. TCCR1B = _BV(WGM12) | _BV(CS11);
  28. OCR1B = 74;
  29.  
  30. TCCR0 = _BV(WGM01) | _BV(CS02) | _BV(CS00);
  31. OCR0 = 255;
  32. TIMSK = _BV(OCIE0);
  33.  
  34. lcd_init(LCD_DISP_ON);
  35.  
  36. ADMUX = _BV(REFS0);
  37. ADCSRA = _BV(ADEN) | _BV(ADPS2) | _BV(ADPS1) | _BV(ADATE) | _BV(ADIE);
  38. SFIOR = _BV(ADTS1) | _BV(ADTS0);
  39. sei();
  40.  
  41. while (1) {
  42.  
  43. }
  44. }
  45.  
  46.  
  47. #ifndef LCD_H
  48. #define LCD_H
  49. /*************************************************************************
  50. Title : C include file for the HD44780U LCD library (lcd.c)
  51. Author: Peter Fleury <pfleury@gmx.ch> http://jump.to/fleury
  52. File: $Id: lcd.h,v 1.13.2.2 2006/01/30 19:51:33 peter Exp $
  53. Software: AVR-GCC 3.3
  54. Hardware: any AVR device, memory mapped mode only for AT90S4414/8515/Mega
  55. ***************************************************************************/
  56.  
  57. /**
  58. @defgroup pfleury_lcd LCD library
  59. @code #include <lcd.h> @endcode
  60.  
  61. @brief Basic routines for interfacing a HD44780U-based text LCD display
  62.  
  63. Originally based on Volker Oth's LCD library,
  64. changed lcd_init(), added additional constants for lcd_command(),
  65. added 4-bit I/O mode, improved and optimized code.
  66.  
  67. Library can be operated in memory mapped mode (LCD_IO_MODE=0) or in
  68. 4-bit IO port mode (LCD_IO_MODE=1). 8-bit IO port mode not supported.
  69.  
  70. Memory mapped mode compatible with Kanda STK200, but supports also
  71. generation of R/W signal through A8 address line.
  72.  
  73. @author Peter Fleury pfleury@gmx.ch http://jump.to/fleury
  74.  
  75. @see The chapter <a href="http://homepage.sunrise.ch/mysunrise/peterfleury/avr-lcd44780.html" target="_blank">Interfacing a HD44780 Based LCD to an AVR</a>
  76. on my home page.
  77.  
  78. */
  79.  
  80. /*@{*/
  81.  
  82. #if (__GNUC__ * 100 + __GNUC_MINOR__) < 303
  83. #error "This library requires AVR-GCC 3.3 or later, update to newer AVR-GCC compiler !"
  84. #endif
  85.  
  86. #include <inttypes.h>
  87. #include <avr/pgmspace.h>
  88.  
  89. /**
  90. * @name Definitions for MCU Clock Frequency
  91. * Adapt the MCU clock frequency in Hz to your target.
  92. */
  93. #define XTAL 7372800 /**< clock frequency in Hz, used to calculate delay timer */
  94.  
  95.  
  96. /**
  97. * @name Definition for LCD controller type
  98. * Use 0 for HD44780 controller, change to 1 for displays with KS0073 controller.
  99. */
  100. #define LCD_CONTROLLER_KS0073 0 /**< Use 0 for HD44780 controller, 1 for KS0073 controller */
  101.  
  102. /**
  103. * @name Definitions for Display Size
  104. * Change these definitions to adapt setting to your display
  105. */
  106. #define LCD_LINES 2 /**< number of visible lines of the display */
  107. #define LCD_DISP_LENGTH 16 /**< visibles characters per line of the display */
  108. #define LCD_LINE_LENGTH 0x40 /**< internal line length of the display */
  109. #define LCD_START_LINE1 0x00 /**< DDRAM address of first char of line 1 */
  110. #define LCD_START_LINE2 0x40 /**< DDRAM address of first char of line 2 */
  111. #define LCD_START_LINE3 0x14 /**< DDRAM address of first char of line 3 */
  112. #define LCD_START_LINE4 0x54 /**< DDRAM address of first char of line 4 */
  113. #define LCD_WRAP_LINES 0 /**< 0: no wrap, 1: wrap at end of visibile line */
  114.  
  115.  
  116. #define LCD_IO_MODE 1 /**< 0: memory mapped mode, 1: IO port mode */
  117. #if LCD_IO_MODE
  118. /**
  119. * @name Definitions for 4-bit IO mode
  120. * Change LCD_PORT if you want to use a different port for the LCD pins.
  121. *
  122. * The four LCD data lines and the three control lines RS, RW, E can be on the
  123. * same port or on different ports.
  124. * Change LCD_RS_PORT, LCD_RW_PORT, LCD_E_PORT if you want the control lines on
  125. * different ports.
  126. *
  127. * Normally the four data lines should be mapped to bit 0..3 on one port, but it
  128. * is possible to connect these data lines in different order or even on different
  129. * ports by adapting the LCD_DATAx_PORT and LCD_DATAx_PIN definitions.
  130. *
  131. */
  132. #define LCD_PORT PORTD /**< port for the LCD lines */
  133. #define LCD_DATA0_PORT LCD_PORT /**< port for 4bit data bit 0 */
  134. #define LCD_DATA1_PORT LCD_PORT /**< port for 4bit data bit 1 */
  135. #define LCD_DATA2_PORT LCD_PORT /**< port for 4bit data bit 2 */
  136. #define LCD_DATA3_PORT LCD_PORT /**< port for 4bit data bit 3 */
  137. #define LCD_DATA0_PIN 0 /**< pin for 4bit data bit 0 */
  138. #define LCD_DATA1_PIN 1 /**< pin for 4bit data bit 1 */
  139. #define LCD_DATA2_PIN 2 /**< pin for 4bit data bit 2 */
  140. #define LCD_DATA3_PIN 3 /**< pin for 4bit data bit 3 */
  141. #define LCD_PORTD PORTD /**< port for the LCD lines */
  142. #define LCD_RS_PORT LCD_PORTD /**< port for RS line */
  143. #define LCD_RS_PIN 5 /**< pin for RS line */
  144. #define LCD_RW_PORT LCD_PORTD /**< port for RW line */
  145. #define LCD_RW_PIN 6 /**< pin for RW line */
  146. #define LCD_E_PORT LCD_PORTD /**< port for Enable line */
  147. #define LCD_E_PIN 7 /**< pin for Enable line */
  148.  
  149. #elif defined(__AVR_AT90S4414__) || defined(__AVR_AT90S8515__) || defined(__AVR_ATmega64__) || \
  150. defined(__AVR_ATmega8515__)|| defined(__AVR_ATmega103__) || defined(__AVR_ATmega128__) || \
  151. defined(__AVR_ATmega161__) || defined(__AVR_ATmega162__)
  152. /*
  153. * memory mapped mode is only supported when the device has an external data memory interface
  154. */
  155. #define LCD_IO_DATA 0xC000 /* A15=E=1, A14=RS=1 */
  156. #define LCD_IO_FUNCTION 0x8000 /* A15=E=1, A14=RS=0 */
  157. #define LCD_IO_READ 0x0100 /* A8 =R/W=1 (R/W: 1=Read, 0=Write */
  158. #else
  159. #error "external data memory interface not available for this device, use 4-bit IO port mode"
  160.  
  161. #endif
  162.  
  163.  
  164. /**
  165. * @name Definitions for LCD command instructions
  166. * The constants define the various LCD controller instructions which can be passed to the
  167. * function lcd_command(), see HD44780 data sheet for a complete description.
  168. */
  169.  
  170. /* instruction register bit positions, see HD44780U data sheet */
  171. #define LCD_CLR 0 /* DB0: clear display */
  172. #define LCD_HOME 1 /* DB1: return to home position */
  173. #define LCD_ENTRY_MODE 2 /* DB2: set entry mode */
  174. #define LCD_ENTRY_INC 1 /* DB1: 1=increment, 0=decrement */
  175. #define LCD_ENTRY_SHIFT 0 /* DB2: 1=display shift on */
  176. #define LCD_ON 3 /* DB3: turn lcd/cursor on */
  177. #define LCD_ON_DISPLAY 2 /* DB2: turn display on */
  178. #define LCD_ON_CURSOR 1 /* DB1: turn cursor on */
  179. #define LCD_ON_BLINK 0 /* DB0: blinking cursor ? */
  180. #define LCD_MOVE 4 /* DB4: move cursor/display */
  181. #define LCD_MOVE_DISP 3 /* DB3: move display (0-> cursor) ? */
  182. #define LCD_MOVE_RIGHT 2 /* DB2: move right (0-> left) ? */
  183. #define LCD_FUNCTION 5 /* DB5: function set */
  184. #define LCD_FUNCTION_8BIT 4 /* DB4: set 8BIT mode (0->4BIT mode) */
  185. #define LCD_FUNCTION_2LINES 3 /* DB3: two lines (0->one line) */
  186. #define LCD_FUNCTION_10DOTS 2 /* DB2: 5x10 font (0->5x7 font) */
  187. #define LCD_CGRAM 6 /* DB6: set CG RAM address */
  188. #define LCD_DDRAM 7 /* DB7: set DD RAM address */
  189. #define LCD_BUSY 7 /* DB7: LCD is busy */
  190.  
  191. /* set entry mode: display shift on/off, dec/inc cursor move direction */
  192. #define LCD_ENTRY_DEC 0x04 /* display shift off, dec cursor move dir */
  193. #define LCD_ENTRY_DEC_SHIFT 0x05 /* display shift on, dec cursor move dir */
  194. #define LCD_ENTRY_INC_ 0x06 /* display shift off, inc cursor move dir */
  195. #define LCD_ENTRY_INC_SHIFT 0x07 /* display shift on, inc cursor move dir */
  196.  
  197. /* display on/off, cursor on/off, blinking char at cursor position */
  198. #define LCD_DISP_OFF 0x08 /* display off */
  199. #define LCD_DISP_ON 0x0C /* display on, cursor off */
  200. #define LCD_DISP_ON_BLINK 0x0D /* display on, cursor off, blink char */
  201. #define LCD_DISP_ON_CURSOR 0x0E /* display on, cursor on */
  202. #define LCD_DISP_ON_CURSOR_BLINK 0x0F /* display on, cursor on, blink char */
  203.  
  204. /* move cursor/shift display */
  205. #define LCD_MOVE_CURSOR_LEFT 0x10 /* move cursor left (decrement) */
  206. #define LCD_MOVE_CURSOR_RIGHT 0x14 /* move cursor right (increment) */
  207. #define LCD_MOVE_DISP_LEFT 0x18 /* shift display left */
  208. #define LCD_MOVE_DISP_RIGHT 0x1C /* shift display right */
  209.  
  210. /* function set: set interface data length and number of display lines */
  211. #define LCD_FUNCTION_4BIT_1LINE 0x20 /* 4-bit interface, single line, 5x7 dots */
  212. #define LCD_FUNCTION_4BIT_2LINES 0x28 /* 4-bit interface, dual line, 5x7 dots */
  213. #define LCD_FUNCTION_8BIT_1LINE 0x30 /* 8-bit interface, single line, 5x7 dots */
  214. #define LCD_FUNCTION_8BIT_2LINES 0x38 /* 8-bit interface, dual line, 5x7 dots */
  215.  
  216.  
  217. #define LCD_MODE_DEFAULT ((1<<LCD_ENTRY_MODE) | (1<<LCD_ENTRY_INC) )
  218.  
  219.  
  220.  
  221. /**
  222. * @name Functions
  223. */
  224.  
  225.  
  226. /**
  227. @brief Initialize display and select type of cursor
  228. @param dispAttr \b LCD_DISP_OFF display off\n
  229. \b LCD_DISP_ON display on, cursor off\n
  230. \b LCD_DISP_ON_CURSOR display on, cursor on\n
  231. \b LCD_DISP_ON_CURSOR_BLINK display on, cursor on flashing
  232. @return none
  233. */
  234. extern void lcd_init(uint8_t dispAttr);
  235.  
  236.  
  237. /**
  238. @brief Clear display and set cursor to home position
  239. @param void
  240. @return none
  241. */
  242. extern void lcd_clrscr(void);
  243.  
  244.  
  245. /**
  246. @brief Set cursor to home position
  247. @param void
  248. @return none
  249. */
  250. extern void lcd_home(void);
  251.  
  252.  
  253. /**
  254. @brief Set cursor to specified position
  255.  
  256. @param x horizontal position\n (0: left most position)
  257. @param y vertical position\n (0: first line)
  258. @return none
  259. */
  260. extern void lcd_gotoxy(uint8_t x, uint8_t y);
  261.  
  262.  
  263. /**
  264. @brief Display character at current cursor position
  265. @param c character to be displayed
  266. @return none
  267. */
  268. extern void lcd_putc(char c);
  269.  
  270.  
  271. /**
  272. @brief Display string without auto linefeed
  273. @param s string to be displayed
  274. @return none
  275. */
  276. extern void lcd_puts(const char *s);
  277.  
  278.  
  279. /**
  280. @brief Display string from program memory without auto linefeed
  281. @param s string from program memory be be displayed
  282. @return none
  283. @see lcd_puts_P
  284. */
  285. extern void lcd_puts_p(const char *progmem_s);
  286.  
  287.  
  288. /**
  289. @brief Send LCD controller instruction command
  290. @param cmd instruction to send to LCD controller, see HD44780 data sheet
  291. @return none
  292. */
  293. extern void lcd_command(uint8_t cmd);
  294.  
  295.  
  296. /**
  297. @brief Send data byte to LCD controller
  298.  
  299. Similar to lcd_putc(), but without interpreting LF
  300. @param data byte to send to LCD controller, see HD44780 data sheet
  301. @return none
  302. */
  303. extern void lcd_data(uint8_t data);
  304.  
  305.  
  306. /**
  307. @brief macros for automatically storing string constant in program memory
  308. */
  309. #define lcd_puts_P(__s) lcd_puts_p(PSTR(__s))
  310.  
  311. /*@}*/
  312. #endif //LCD_H
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